Please help me fix my python program: (see image attached for error message) import random def nucleotide(str1, X): #1. Take two parameters, a nucleotide sequence as a string, and an integer. #2. Check for invalid characters (not ATCG). for i in str1: if i != 'A' or i != 'T' or i != 'G' or i != 'C': sys.exit("Invalid nucleotide") #2. If invalid character is found, exit function #3. Make the entire string lower case str1 = str1.lower() lst = list(str1) #Convert string to list #4. for i in range(0,X): num = len(str1) charPosition = random.randint(0,num-1) #Choose a character position in the string at random charNucleotide = lst[charPosition] #Determine which nucleotide is at that position. randomNucleotide = lst[random.randint(0,3)] #At random, select a different nucleotide and replace the previous nucleotide with the new one. lst[charPosition] = randomNucleotide.upper() listToStr = ''.join(map(str, lst)) #Convert list to string. return listToStr #6. Return the new string #5. Test your code str1 = nucleotide("ATGCGTACTG", 4) print("Orignal nucleotide: ATGCGTACTG") print ("New nucleotide:",str1) This is the guideline in making the code above: I need help to write a function that: 1. Take two parameters, a nucleotide sequence as a string, and an integer. 2. Check for invalid characters (not ATCG). If invalid character is found, exit function 3. Make the entire string lower case 4. For X iterations, where x is the integer parameter - Choose a character position in the string at random - Determine which nucleotide is at that position. At random, select a different nucleotide and replace the previous nucleotide with the new one. Use String splicing, or list() and "".join() -The new nucleotide should be uppercase so that the substitution is clear and obvious. 5. Test your code to make sure this behavior works as intended. Keep the number of iterations low, and add in a reporting mechanism that makes it clear what is happening (what position was chosen, what new nucleotide was chosen, etc). Comment out this out once you're sure the function works as it should. 6. Return the new string

Please help me fix my python program: (see image attached for error message) import random def nucleotide(str1, X): #1. Take two parameters, a nucleotide sequence as a string, and an integer. #2. Check for invalid characters (not ATCG). for i in str1: if i != 'A' or i != 'T' or i != 'G' or i != 'C': sys.exit("Invalid nucleotide") #2. If invalid character is found, exit function #3. Make the entire string lower case str1 = str1.lower() lst = list(str1) #Convert string to list #4. for i in range(0,X): num = len(str1) charPosition = random.randint(0,num-1) #Choose a character position in the string at random charNucleotide = lst[charPosition] #Determine which nucleotide is at that position. randomNucleotide = lst[random.randint(0,3)] #At random, select a different nucleotide and replace the previous nucleotide with the new one. lst[charPosition] = randomNucleotide.upper() listToStr = ''.join(map(str, lst)) #Convert list to string. return listToStr #6. Return the new string #5. Test your code str1 = nucleotide("ATGCGTACTG", 4) print("Orignal nucleotide: ATGCGTACTG") print ("New nucleotide:",str1) This is the guideline in making the code above: I need help to write a function that: 1. Take two parameters, a nucleotide sequence as a string, and an integer. 2. Check for invalid characters (not ATCG). If invalid character is found, exit function 3. Make the entire string lower case 4. For X iterations, where x is the integer parameter - Choose a character position in the string at random - Determine which nucleotide is at that position. At random, select a different nucleotide and replace the previous nucleotide with the new one. Use String splicing, or list() and "".join() -The new nucleotide should be uppercase so that the substitution is clear and obvious. 5. Test your code to make sure this behavior works as intended. Keep the number of iterations low, and add in a reporting mechanism that makes it clear what is happening (what position was chosen, what new nucleotide was chosen, etc). Comment out this out once you're sure the function works as it should. 6. Return the new string

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Please help me fix my python program: (see image attached for error message)

import random

def nucleotide(str1, X): #1. Take two parameters, a nucleotide sequence as a string, and an integer.

#2. Check for invalid characters (not ATCG).
for i in str1:
if i != 'A' or i != 'T' or i != 'G' or i != 'C':
sys.exit("Invalid nucleotide") #2. If invalid character is found, exit function

#3. Make the entire string lower case
str1 = str1.lower()
lst = list(str1) #Convert string to list

#4.
for i in range(0,X):
num = len(str1)
charPosition = random.randint(0,num-1) #Choose a character position in the string at random
charNucleotide = lst[charPosition] #Determine which nucleotide is at that position.

randomNucleotide = lst[random.randint(0,3)] #At random, select a different nucleotide and replace the previous nucleotide with the new one.

lst[charPosition] = randomNucleotide.upper()

listToStr = ''.join(map(str, lst)) #Convert list to string.
return listToStr #6. Return the new string

#5. Test your code

str1 = nucleotide("ATGCGTACTG", 4)
print("Orignal nucleotide: ATGCGTACTG")
print ("New nucleotide:",str1)

This is the guideline in making the code above:

I need help to write a function that:

1. Take two parameters, a nucleotide sequence as a string, and an integer.

2. Check for invalid characters (not ATCG). If invalid character is found, exit function

3. Make the entire string lower case

4. For X iterations, where x is the integer parameter

- Choose a character position in the string at random

- Determine which nucleotide is at that position. At random, select a different nucleotide and replace the previous nucleotide with the new one. Use String splicing, or list() and "".join()

-The new nucleotide should be uppercase so that the substitution is clear and obvious.

5. Test your code to make sure this behavior works as intended. Keep the number of iterations low, and add in a reporting mechanism that makes it clear what is happening (what position was chosen, what new nucleotide was chosen, etc). Comment out this out once you're sure the function works as it should.

6. Return the new string

main.py
1 import random
2
3- def nucleotide(str1, X): #1. Take two parameters, a nucleotide sequence as a stri
#2. Check for invalid characters (not ATCG).
for i in str1:
if i != 'A' or i != 'T' or i != 'G' or i != 'C':
sys.exit("Invalid nucleotide") #2. If invalid character is found, exi
#3. Make the entire string Lower case
str1 = str1.lower()
1st =
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list(str1) #Convert string to list
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#4.
for i in range(0,X):
num = len(str1)
charPosition = random.randint(0,num-1) #Choose a character position in th
charNucleotide = 1st[charPosition] #Determine which nucleotide is at tho
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randomNucleotide = 1st[random.randint(0,3)] #At random, select a differe
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input
File "main.py", line 8, in nucleotide
sys.exit("Invalid nucleotide") #2. If invalid character is found, exit function
NameError: name 'sys' is not defined
... Program finished with exit code 0
Press ENTER to exit console.I
LO N

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